Pencil



J. SWANBERG."

PENCIL.

APPLICATION FILED NOV. 10, I919.

Patented June 14-, 1921 Z 5 V5 1|: Jul'us Sunberg EEEEE W yJ 'L Q a H:

UNITED STATES PATENT 0FFICE.

JULIUS SWANBERG, OF CHICAGO, ILLINOIS, ASSIGNOR 'I'O FAIBART INSTRUMENT COMPANY, A CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented June 14, 1921.

To all whom it may concern:

Be it known that I, J ULIUS SWANBERG, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook'and State of Illinois, have invented certain new and useful Improvements in Pencils; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

This invention relates to pencils and more particularly to the self-sharpening type of metallic pencil.

Due to the fact that suitable wood for pencils is continually becoming more difficult to obtain, metallic casings are now coming to be quite generally used.

The metallic casings as heretofore constructed have been so complicated and expensive that the average user could not afi'ord to buy them or they have been poorly constructed and unsuccessful in operation.

It is therefore an object of this invention to provide a pencil having a metallic casing which can be economically constructed and i which is at the same time durable and positive in operation.

It is another object of this invention to provide a pencil that does not require sharpening.

It is a further object of this invention to provide a pencil having a metallic casing with a chamber for extra leads contained therein.

It is an important object of this invention to provide a pencil with a metallic casing that is adapted to effectually utilize the entire'length ofthe leads.

Other and further important objects of this'invention willbe apparent from the disclosures in the drawings and specification.

The invention (in'a preferred form) is illustrated in the drawings and hereinafter more fully described.

On the drawin Figure 1 is a fi ont elevation of a pencil embodying this invention.

Fig. 2 is a vertical longitudinal section taken through a pencil embodying this invention.

Fig. 3 is a slightly enlarged section on line 33 of Fig. 2.

Fig. dis a fragmentary enlarged sectional view of the conical point of the pencil shown in Fig. 2.

Fig. 5 is a slightly enlarged section on line 55 of Fig. 2.

As shown on the drawings:

The reference numeral 1 indicates a cylindrical metallic casing having a conical point 2 formed thereon. Secured to the outside of the metallic casing 1, near its upper end, by brazlng or other suitable means is the pocket clip 3. The upper edge of the casing 1 is headed inwardly to resiliently engage a groove 4:, in the cap 5, and a longitudinal slot 6 is provided in the casing 1 to permit the upper edges thereof to be forced apart to insert said cap. A knurled flange 7 on the cap 5 adapts it to be easily grasped and turned.

Non-rotatably secured to the inner side of the cap 5 is a lead-screw 8, preferably having left hand threads formed thereon. Slidably mounted inside the casing is a nut 9 threaded for engagement with the leadscrew 8. The nut 9 is prevented from rotating in the casing 1, by the walls 10, which extend longitudinally, in parallel relation through the interior of the casing 1, and which also serve with the casing to form chambers 11 for containing extra leads 12, as shown in Fig. 3.

Secured to opposite sides of the nut 9 are flat leaf springs 13 and 14;, which are slidable between the walls 10 and which are be seen that the pencil will just as successfully operate without the walls 10 and these walls are preferably omitted when an inexpensive construction is sought. A downtion of the nut 9 in the casing. Thus it will U wardly concave plate 15, preferably integral 5 with the springs 13 and 14:, is provided to connect the lower ends thereof and engage the upper end of the lead 16. A metallic guide 17 provided with a longitudinal aperture 18 for the lead 16 is secured in the conical point 2. The inner end of the guide 17 is beveled to admit of easy insertion of the lead in the aperture 18 and is bent inwardly for frictional engagement with the lead. The nner end of the guide 17 is also provided with notches which form the spring fingers 20, which frictionally engage the lead.

The guide 17 is provided with a flange 19 at its outer end. The flange 19 is flush with the outer edge of the casing and prevents the guide 17 from being forced into the casing.

The operation is as follows:

The pencil is of the self sharpening type and when the point becomes worn the lead 16 can be fed outwardly through the aperture 18 in the guide 17 by turning the cap 5 to the right, whereby the lead-screw 8 is likewise turned to the right and the threads thereon engag the internally threaded nut 9. Since the lead-screw 8 is provided with a left hand thread, turning the cap 5 to the right will force the nut 9 and the attached lead-feeding mechanisms downwardly. This is accomplished by downward movement of the nut 9 and the attached springs 13 and 1 1 andthe plate 15, which contacts the lead 16. and forces it outwardly through the aperture 18in theguide 17 until the desired length of point is obtained.

To replenish the lead 16 the cap 5 is first turned to the left until the nut 9 and the attached springs and plate are returned to the upper part of the casing. The cap 5 is then withdrawn from its spring engagement with the upper end of the casing, and the attached mechanisms are removed from the casing 1 and an extra lead is taken from the chamber- 11 and inserted in the aperture 18 in the guide 17. The cap 5 is then replaced in the casing and turned to the right until the plate 15 contacts the new lead. The conical point 2 of the casing is of such diameter that if desired leads inserted in the upper end of thecasing will be readily guided to the aperture 18.

I am aware that numerous details of construction may be varied through a wide range Without departing from the principles ofthis invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

' I claim as myinvention:

1. A pencil of the class described comprising av casing, parallel longitudinal walls forming pockets in the casing, and a leadfeeding mechanism resiliently engaging the casing and slidable between the walls.

2. In a pencil, a lead, frictional means for retarding the motion of said lead, a u shaped spring the center portion of which engages said lead, a screw, and means at the ends of the spring coacting with said screw to drive the spring and so move the lead.

3. In a pencil, a lead, frictional means for retarding the motion of said lead, a U-shaped spring the center portion of which engages said lead, a screw, and means at the ends of the spring coacting with said screw to drive the spring and so move the lead, the sides of said spring being bowed outward.

4. In a pencil, a barrel, a lead within said barrel, frictional means for retarding the motion of said lead, a U-shaped spring the center portion of which engages said lead, a screw, and means at the ends of the spring coacting with said screw to drive the spring and so move the lead, the sides of the spring contacting with said barrel and being frictionally held against rotation.

5. In a pencil, a barrel, a lead within said barrel, frictional means for retarding the motion of said lead, a Ushaped spring the center portion of which engages said lead, a screw, and means at the ends of the spring coacting with said screw to drive the spring and so move the lead, the center of said spring being concave toward the lead.

6. In a pencil, a barrel, a lead Within said barrel, frictional means for retarding the motion of said lead, a U-shaped spring the center portion of which engages said lead, a nut to which the free ends of saidspring are secured, and a screw coacting with said nut to driv the spring andso move the lead, the

center of said spring being concave toward the lead.

7. In a pencil, a tip, a guide integral with said tip, tongues integral with said guide converging inward from the inner end of said guide and beveled at their inner ends.

8. In a pencil, a tip, atubular guide integral with said tip and extending into the interior of the pencil, slits in the inner, end of said guide forming tongues, said tongues being bent toward each other and the concave surfaces of the inner ends of said tongues being beveled to form a funnel shaped opening.

In testimony whereof I. have hereunto subscribed my namein the presence of two subscribing witnesses.

JULIUS SWANBERG. l/Vitnesses:

EARL M. HARDINE, ARLES WHILLS, Jr- 

